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Power - your wifi router puts out about 0.1 - 1.0 W, your microwave oven puts out 1000W.
It would take a lot of wifi routers to cook a turkey - more than you think because the antennea on the router is designed to spread the power evenly around the room rather than concentrate it on the center of the oven.

There is a danger of being 'cooked' from being close to very high power transmitters such as some warship's radar while they are operating.

ps. It's the same reason your laser pointer can't be used to cut steel plates (or James Bond) in half!